US3870883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing machine with self-cleaning coronal generating device
Assignee: Xerox Corp
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Filing: 1973-09-24
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Granted: 1975-03-11
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Expires: 1993-09-24
Abstract
Abstract A printing machine corona generating device having a corona wire and a shield surrounding the wire has a cleaning pad which is moved along the corona wire and interior surfaces of the shield in response to a signal which is automatically generated after a predetermined machine event, for example, after each copy run. A mechanism is used which causes the pad to move from one end of the wire and back, and then stop.
Inventors
- 👤 Jack R Oagley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:48
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0258; G03G15/0291
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
An improved electrostatic printing machine comprising means defining a photoconductive surface which is adapted to move around a closed path, means including at least one corona geNerating device for making a copy of an original document, the corona generating device being disposed adjacent the photoconductive surface along the closed path, the corona generating device having a corona wire and a generally U-shaped elongated shield around the corona wire, and a cleaning pad contacting the corona wire and the inner surface of the shield such that when moved along the device, the wire and substantially the entire inner surface of the shield will be cleaned, the improvement comprising: means for automatically moving the cleaning pad along the corona wire and shield to complete a cycle of operation upon receiving an input signal after a predetermined machine event has occurred.
Claim 2
Dependent Claim
138 words
An improved electrostatic printing machine comprising means defining a photoconductive surface which is adapted to move around a closed path, means including at least one corona geNerating device for making a copy of an original document, the corona generating device being disposed adjacent the photoconductive surface along the closed path, the corona generating device having a corona wire and a generally U-shaped elongated shield around the corona wire, and a cleaning pad contacting the corona wire and the inner surface of the shield such that when moved along the device, the wire and substantially the entire inner surface of the shield will be cleaned, the improvement comprising: means for automatically moving the cleaning pad along the corona wire and shield to complete a cycle of operation upon receiving an input signal after a predetermined machine event has occurred.
Claim 3
Dependent Claim
138 words
An improved electrostatic printing machine comprising means defining a photoconductive surface which is adapted to move around a closed path, means including at least one corona geNerating device for making a copy of an original document, the corona generating device being disposed adjacent the photoconductive surface along the closed path, the corona generating device having a corona wire and a generally U-shaped elongated shield around the corona wire, and a cleaning pad contacting the corona wire and the inner surface of the shield such that when moved along the device, the wire and substantially the entire inner surface of the shield will be cleaned, the improvement comprising: means for automatically moving the cleaning pad along the corona wire and shield to complete a cycle of operation upon receiving an input signal after a predetermined machine event has occurred.
Claim 4
Dependent Claim
138 words
An improved electrostatic printing machine comprising means defining a photoconductive surface which is adapted to move around a closed path, means including at least one corona geNerating device for making a copy of an original document, the corona generating device being disposed adjacent the photoconductive surface along the closed path, the corona generating device having a corona wire and a generally U-shaped elongated shield around the corona wire, and a cleaning pad contacting the corona wire and the inner surface of the shield such that when moved along the device, the wire and substantially the entire inner surface of the shield will be cleaned, the improvement comprising: means for automatically moving the cleaning pad along the corona wire and shield to complete a cycle of operation upon receiving an input signal after a predetermined machine event has occurred.
Claim 5
Dependent Claim
97 words
An improved electrostatic printing machine as set forth in claim 1, wherein the automatic moving means includes a double helix screw, a motor for rotating the screw, a follower mounted upon the screw, means defining an opening along the length of the shield, means extending through the opening and connecting the pad to the follower, first means adapted to be actuated by an input signal for initially starting the motor to begin the cycle of operation, and second means mounted so as to be actuated by the movement of the follower to complete the cycle of operation.
Claim 6
Dependent Claim
31 words
An improved electrostatic printing machine as set forth in claim 2, and further including means for delivering an input signal after each copy run to initiate movement of the cleaning pad.
References Cited (Backward Citations)
US2791949A
Cited
US3496352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |